Fuse-plug



RL B.4BEN1AMIN. I

Fuse PLUG. .l 'APPLJYCATION FILED Aulmz's"l 1915..

Batented Jan.- 20, 1920.

2 SHEETS-SHEET l- UNITED STATES PATENT oEuficE.4

REUBEN B. BENJAMIN, 0F CHICAGO, ILLINOIS, ASSIGNOR TO BENJAMIN ELCTRIG MANUFACTURING; COMPANY, OF CHICAGO, ILLINOIS, AV CORPORATION 0F ILLI- NOIS.

FUSE-PLUG.

Speciication of Letters Patent.

Patented Jan. 2o, 1920.

`Application filed August 25,1915. Serial No. 47,345.

To all whom may concern.'

Be it known that I, REUBEN B. BENJAMIN,

a citizen of the United States, residing atA Chicago, in the county of Cook and State of Illinios, have invented new and useful Improvements in F use-Plugs, of which the following is a' full, clear, concise, and exact description, reference being had ,to the accompanying drawing forming a part 'of this specification.

My invention relates to fuse plugs, and more specifically to magazine fuse plugs, that is, to plugs in which a plurality of fuses are provided any one of which can be placed in circuit with the plug contacts.

Among t-he objects of my invention is to4 provide a fuse plug which will be simple in construction, etlicient in use and in which improved means are provided whereby the different fuses can be placed in circuit, and which is easily operated to place the different fuses in circuit.

F urther objects will appear from' the description to follow taken in -connection with the appended claims. l

In the drawings, in'which I have illustrated two embodiments of my invention- Figure 1 is an axial section of a magazine fuse plug embodying my invention;

Fig. 2 is a transverse section on the line 22 of Fig.1;

Fig. 3 is a transverse section on the line 3-3 of Fig. l;

Fig. 1L is a plan view of the connecting device or switch plug used to connect the 'fuses with the plug contacts;

Fig. 5 is an axial section of a modification` in which the switch plug 1s rotatably mounted at 10 a threaded shell contact 11, and a center contact l2 for engagement with the corresponding contacts of a receptacle, a plurality of fuses 13, and a connector device or switch plug lf-l which can be inserted in various positions to connect the different fuses with the center and shell contacts 12 and 11. The supporting device 10 comprises' an insulating base 15 to which is secured a retaining cap or disk 16 byvmeans of the center cont'ct 12 and a plate 17 for clamping the fuses 13 in engagement with the shell contact l1. The base 15 is provided witha plurality of longitudinally extending parallel passages 18 through which the fuses 13 extend, and is recessed as shown at 19 to provide a space for the connection from the 4fuses to the switch plug. The base 15 is reduced, as show-n at 20. where it 1s surrounded by the shell contact 11, and is provided with a plurality of grooves 21 extending between the passages 18 to accommodate a correspondingly grooved portion of the shell contact 11 in which parts of the fuses 13 are located. The base 15 and shell 11 are provided with corresponding grooves, as shownV at 22, to permit the escape of the gases generated by the blowing of the fuses. The base 15 is also provided with a plurality of grooves 23 to provide an additional passage for the escape-of the gases. The base 15 has an enlarged portion 24 forming a thumb piece by means of which the plug may be screwed into the receptacle, and also forming a support for the retaining member which holds' the insulating ,mica disk in place. The shell contact 11 has the usual screw threaded portion 25 and an inwardly extending flange portion 26 which is provided with grooves 27 and 28 corresponding to the grooves 21. and 22 of the base 1'5.

The plate 17 is provided with a plurality of grooves 29 opposite the grooves 37 of the Harige 26 between which grooves portions of the fuses are located. The center contact sages 187 portions 33 located inthe recesses 19 and lextending radially outward, and portions 341 also located in the recesses 19 and extending atan angle tothe portions 33. lonductors 35 are provided to afford a connection` between the fuses and the Iswitch necting the member 45 with the .contact member 45 compr-ises plug 14. These conductors are wrapped around the portions 34 of the fuses as shown at 36 and are provided with parallel contiguous portions 37 which extend inwardly, and upwardly bent portions 38 forming' contacts for engagement with the contact of the switch plug.

The recesses 19 are closed by means oi' an insulating plate 39 of mica or other suitable transparent or translucent material which extends beneath the conductors 35 and is held in place on the base 15 by means of a retaining member 40 which is iianged over the enlarged ortion 24 of the base, as shown at 41 and 42. l The base 15 is centrally recessed as shown at 43 to receive the switch lug. This recess 43 is provided with a plurality of parallel grooves 44 which cooperate with corresponding ribs onthe switch plug to prevent relative rotation between 'the switch plug and base, when the switch plug is inserted. The switch plug 14 comprises a contact and con ductor member 45 -or engagement-with the center contact 12, a contact and conductor member 46 for con- Contact portion 38, and a handle and supporting member 47 by means of which the plug is handled and which supports the members 45 and 46. The two spaced tongues 48 which extend within thecenter contact 12 when the switch plug is in position, and an eye portion 49 which is embedded in the insulating handle 47. This contact member 45 may be conveniently formed from an ordinary spring split pin. The 'member 46 comprises a springcontact por- `tion 50 for engagement with the contact por-A tion 38, and a baseportion 51 which lies between the spaced tongues 48 and is securely held in place by forming a. depression in the base 51, and a corresponding projection in one Vof the tongues 48 as shown at 52. An opening 53 is provided within the member 46 through which one of the tongues 48 eX- tends. he member 47 comprises a portion extending into the recess 43 of thebase 15, a handle or thumb engaging portion 55 an an indicator 56 for determining when one of the fuses is connected in circuit. rlhe portion 54 is provided with a plurality of ribs 57 for engagement with the grooves 44 for preventing relative rotation between the switch plug and base when the former is inserted. The plug 14 is recessed as shown at 58 to receive the lower end ci the spring contact portion 50 to hold it in place. The circuit through the plug is from the center contact 12, through the members 45, 46, 35 and fuse 13 to theshell contact 11.

The use and operation of the plug is as follows: The' contact and fuse supporting device 10 is screwed into a receptacle and the switch plug 14 is inserted to connect one of the fuses 13 with the contacts 11 and 12J dicator 69 fuses is placed in circui recense 14y is withdrawn and when it is desired to connect another fuse in the circuit the plug 14 is again inserted to connect another one of the fuses. vBy means of the transparent insulating plate 39 it can be determined, by inspection, which of the fuses has been blown, and by means of the indicator 56 .it can be determined will be connected when the switch plug is inserted. The manner in which the connection is made between the center contact 12 and the tongues 48 insures a quick break of the circuit between these parts and prevents arcing. The grooves 22, 23 and-29 permit the gases resulting from the blowing of the 'fuses to escape at the inner end of the plug. The non-rotatable connection between the switch plug 14 and base 15 prevents any possibility or' turning the switch plug 14 when it is inserted which might result in arcing or making a poor contact.

In the modification of Figs. 5, 6 and 7 the parts 11, 1X2, 13, 16, 35, 39 and 40 are substantially Vthe same as the corresponding parts or' the piug shown in Figs. 1, 2, 3 and 4 and will not be described in detail.

The insiilating contact and fuse support ing device 59 of this modification is also substantiallythe same except that one side of the hub 60 is made sloping as shown at 61 to permit the spring contact to ride up along `this surface out of contact with the cona contact and base portion 66 which is held in place be-v tween the members of the split pin and a contact portionl `67 which is movable into engagement with the various conductor members 35 as the switch plug 62 is rotated. The thumb piece 64 is provided with a recess 68 into which the lower end of the member 65 extends to prevent the lower edge of this member from catching on other portions of the plug as it is withdrawn.' The thumb piece 64 is also provided with an infor showing which The supporting which one of the fuses" pin, a thumb piece 64 in which the member 65 electrically connected one of 4the device 59 of thismodiiication is shown recessed at 70 to provide an additional passage for the escape of the gases due t'o the blowing of the fuses. This passage will lpermit some of the gases to escape into the central chamber of the support 59.'

The use and operation ot' the plug of this modification is as follows: The shell contact 11 is screwed into a' receptacle until the center, contact 12"makes suitable contact with one of the conductors 35.

the center contact of the receptacle. The switch plug 62 is then inserted in a position in which the contact portion 67 will engage vIf the fuse which is thus placed in circuit is blown a new fuse may be placed in circuit when desired by simply rotating the switch plug to cause the contact portion 67 to ride upthe slopingv shoulder 6 1 and snap down into contact with the 'succeedingl conductor 35. Also if desired instead of rotating the plug without removing it to make the new connection the plug may be withdrawn and reinserted in a pew position to make connection with a new use.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. A fuse plug comprising an insulating base, contacts supported thereby for engagement with the contacts of a receptacle, a

plurality of .fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising a connector plug constructed to be inserted and withdrawn without removing the fuses from the receptacle,l said connector plug being completely, readily and quickly detachable with respect to said insulating base by a pull on the plug.

2. A magazine fuse plug comprising an insulating base, a: shell contact supported thereby having an inwardly extending flange and a U-sha-ped fuse member having the portion which connects its arms engaging said flange.

3. A magazine fuse plug comprising an insulating` base, a shell contactsupported thereby having an inwardly extending flange and a Ushaped fuse member having the portion which connects its arms engaging said flange, said flange having openings through which said arms extend.

4. A magazine fuse plug comprising an insulating base, a. shell' contact supported thereby having an inwardly extending flange and a U-shaped fuse member having the portion which connects its arms cngag ing said flange, said flange having openings through which said arms extend, and means for holding said portion against said flange.

5. A magazine fuse plug comprising an insulating base, a shell contact supported thereby having an inwardly extending flange and a U-sha-ped fuse member having the portion whichconnects its arms engaging said flange, said base having an opening into which the arms of the fuse member eX- tend.

6. A fuse plug comprising an insulating base, contacts supported thereby for engagement with the contacts of a receptacle, a plurality of fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising a connector plug constructed to be inserted and withdrawn without removing the fuses from the receptacle, said connector plug and base being provided with interengaging means for preventing relative rotation when the connector plug is inserted, said connecfor plug being completely, readily and` quickly detachable with respect to said insulating base by a pull on the plug.

7. A fuse plug comprising an insulating base, contacts supported thereby for engagement with the contacts of' a receptacle, a plurality of fuses also supported thereby, and means for selective] v placing said fuses in circuit with said contacts colnprising a connector plug constructed to be inserted and withdrawn without. removing the fuses from the receptacle, said connector plug and base being provided with tongue and groove. interengaging means for preventing' relative rotation when the connector plug is inserted.

, S. A fuse plug comprising an insulating base, contacts supported thereby for enga-gement. with the contacts of a receptacle, a plurality of fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising a. connector plug, said connector plug comprising a split pin and a contact member iaving a base portion between the split portions of' the. pin.

9. A fuse plug comprising an insulating base, contacts supported thereby for engagement with the contacts of 'a receptacle, a plurality of fuses also supported thereby, and means for selectively placing said fuses in circuit lwith said contacts, said fuses having portions located adjacent the exposed end of' the plue, and conductors leading from Said port-ions` each conductor comprising a member of' sheet material having a portion embracing said fuse portion.

10. A fuse plug comprising an insulating base, a shell contact supported thereby having'an inwardly extending flange adjacent the entering end of the plue', a fuse having aportion engaging said flange, and means for holding said portion against said fiangc, said holding means including a member which constitutes a center contact.

ll. A fuse plug colnprising an insulating base, contacts supported thereby for engagement with the contacts of a receptacle, a. plurality of fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising a member exposed to be accessible for manual operation, said connector plug being completely, readily and quicklyvr detachable with respect to said insulating base by a pull on the plug. Y

12. A fuse plug comprising an insulating base, contacts supported thereby for engagement with the4 contacts of' a receptacle, a fuse also supported thereby, and means for tacts comprising a connector plug constructi base, shell with each fuse,

ed to be inserted and withdrawn without removing the fuse from the receptacle, said connector plug being completely, readily and quickly detachable with respect to said insulating base by a pull on the plug.

13. A fuse plug comprising au insulating thereby, a plurality ot' fuses electrically connected to said shell contacts adjacent the entering end of the plug, and means for selectively placing said fuses in4 electrical connection with said center contact, said connector plug being completely, readilyvvand quickly detachable with respect to said insulating base by a pull on the plug.

1l. A fuse plug comprising an insulating base, shell and center contacts supported thereby, a pluralit-y of nected to said shell contact adjacent the entering end of the plug, a plurality of contact members, one electrically connected with each fuse, supported by said base, and means for selectively placing said contact members in electrical connection with said center contact.

15. A fuse plug comprising an insulating base, shell and center contacts supported thereby, a plurality of Jfuses electrically connected to said shell contact adjacent the entering end of the plug, a plurality of'contact members, one electrically connected supported jacent the outer'end thereof, and means for selectively placing said contact members in electrical connection with -sa-id center con-. tact.

16. A fuse plug comprising an insulating base, shell and center contacts supported thereby, for engagement with the contacts of the receptacle, a plurality of fuses also supported thereby, and mea-ns for selectively placing said fuses in circuit With said contacts comprising a connector plug, completely, quickly and readily detachable with respect to said insulating-base by a pull on said connector plug Without removing said base Jfrom said receptacle.

and center contacts supported'` fuses electrically con- 4 by said base adscribedl my name in the prese 17. A fuse plug comprising an insulating base, shellv and center contacts supported thereby, for engagement with the contacts of the receptacle,a plurality of fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising a connector plug, completely, ouickly and readily detachablewith respect to said insulating-base by a pull on said connector plug without removing said base from said receptacle, said insulating base having an axial recess connector plug,

18. A fuse plug comprising an insulating base, shell and center contacts supported thereby, for engagement with the contacts to receive said of the receptacle, a plurality of' fuses also suppored thereby, and means for selectively placing said usesin circuit with said contacts comprising a connector plug, oompletely, quickly and readily detachable with respect to said insulating-base by a pull on said connector plug without removing said base from said receptacle, said insulating base having an axial recess to receive sai connector plug, said connector plug comprising aninsulating handle portion.

19. A fuse plug comprising an insulating base, shell and center 'contacts supported thereby, for engagement with the contacts of the receptaclefa plurality ofv fuses also supported thereby, and means for selectively placing said fuses in circuit with said contacts comprising pletely and quickly detachable With respect to said insulating base, Without vremoving' said ybase from said receptacle, said insulating base having an axial recess to receive said connector plug, said cdnnector plug comprising an insulating haiidle portion, said handle port-ion having an extension forming an indicator member.

In witness whereof, I have hereunto subnce of two witnesses.

. REUBEN B. BENJAMIN.

Witnesses: i HARRY E. WA'rso'N,- JAS. H. TAYLOR.

a'connector plug, com- 

